138 PRACTICE OF POULTRY-HOUSE CONSTRUCTION 



frame which is hinged at the back and can be raised for cleaning. It 

 is desirable to raise the roosts so as to force lazy hens to the floor. 

 The floor is made of cement, and any tendency toward cold 

 is eliminated by the liberal use of straw, which in addition compels 

 the hen to exercise in her search for feed. Cement floors are cold 

 because of dampness. This may be prevented by the use of a layer 

 of tar paper in the construction, as already described. 



Frame in process of construction. 



Nearing completion. 



FIG. 916. Half-monitor type of laying house: Under construction. 



For ease in cleaning, all fixtures are portable, and all nests and 

 boxes have sloping tops, thus eliminating the accumulation of 

 filth on the internal fixtures. This house is well adapted for 

 commercial use. 



A Half -monitor Laying House. This house has an entire glass 

 front in the peak (Figs. 91a and 916). The extension in front is 



